Leadership Team

Meet Our Team

GGC National Contractors was founded in 2009 by Jennifer and John Castellano. Today, we have a diverse and dedicated leadership team that is positioning the company for growth, expanding the services offered to our clients, and building successful projects on a national level.

Leadership Team

John Castellano

John Castellano

President (Founding Partner)
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Jennifer Castellano

Jennifer Castellano

Managing Partner (Founding Partner)
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Anthony M. Wincko

Anthony M. Wincko

Executive Vice President (Partner)
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Jeffrey S. Giuggio

Jeffrey S. Giuggio

Vice President (Partner)
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Jim Browder

Jim Browder

Director of Construction
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Matt Johnson

Matt Johnson

Controller
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